Awesome rainwater catchment calculator uses google maps

type in an address, draw a box over your roof or other catchment area and it plugs in local rainfall data and does the calcs!  Definitely a step towards putting the designer in the recliner...
http://www.save-the-rain.com/world-bank/

Hey, that is awesome!  Thanks for posting.

The area of your roof is:
177.4 m²
The amount of rain this area receives in a year is:
300mm
You could harvest:
53220 litres!
That's enough water to flush an average toilet:
8870 times!

Great!  Now for some conversion ....

1,909.52 sq. ft.
11.81 inches
14,059.24 gallons (US)

Oh boy!

The area of your roof is:
56.9 m²
The amount of rain this area receives in a year is:
900mm
You could harvest:
51210 litres!
That's enough water to flush an average toilet:
8535 times!

That's loads of water!  And *far* more than we actually use in the house every year. 

It wasn't able to get my rainfall data here in Mexico...

velacreations wrote:
It wasn't able to get my rainfall data here in Mexico...

Good to know google doesn't know everything...yet.

Shortcut to calculating water from rainfall:

Multiply Sq Ft of roof by inches of rain,
Divide by 1.6

Example:  10' x 16' hen house = 160 sq ft  x 1" rain = 160.  Divided by 1.6 = 100 gallons.
Makes me wonder why people carry water to their chickens.

This is an awesome tool for calculating field areas.  I've just been looking over areas on my property, bit by bit.

The output of the site is in square meters, but it's easy to convert.  Remember that 10,000 square meters is a hectare, which is 2.5 acres.

Dan

The area of your roof is:
102.7 m²
The amount of rain this area receives in a year is:
700mm
You could harvest:
71890 litres!
That's enough water to flush an average toilet:
11982 times!

This is uber-cool! My mom's roof. Gotta send it to her. That`s enough for most of her gardening needs. Now to be able to store all that... Thanks for sharing, very interesting.

thanks for the link we get about 2.5 million gallons on our 7 acres here.

winning!

I only have a small property but here in the rainy UK I get:

The area of your roof is:
40.5 m²
The amount of rain this area receives in a year is:
900mm
You could harvest:
36450 litres!
That's enough water to flush an average toilet:
6075 times!

This is so much easier in metric:

1 millimeter of rain, on one square meter of catchment = 1 liter of water. 

Well of course it depends on rain patterns : how much, when, how often, etc ...

So catch what you can in rain barrels, then in ponds, then in soil

The area of your roof is:
87.6 m²
The amount of rain this area receives in a year is:
1100mm
You could harvest:
96360 litres!
That's enough water to flush an average toilet:
16060 times!

Score 

I wish this app would allow for drawing path's instead of squares, roof water's great but even the crude box i drew in front of my swale says i'm in the market for 200k L of water. I don't even want to consider that true but I'm terrified it's true at 1500mm of rain per year. I'm trying my hardest this winter to shove as much of it underground as I can, but I know she's still running off. I dug a 3 by 10 foot hole about 3 feet deep, I don't know why the ducks told me to I guess. It had a trickle of water coming in last night. This morning it's full and I didn't even get a chance to think about grading it or compacting it, the thing is already spilling down the hill once again. I get the feeling an afternoon with an excavator and I could really put a quarter acre dam in, but I think my landlord might finally figure out i'm trying to put 15% of his property underwater.

Very cool! THanks for sharing! I live in Southern Ontario, Canada, and I gotta say we are blessed with an abundance of water!

This says my average yearly rainfall is 1300mm which is 51 inches.
All other sources say my average yearly rainfall is closer to 37-40 inches, around 1000mm.
That seems like a significant difference.
Is anyone else seeing an inconsistent rain estimate?

Yea this thing is pretty, but it reports annual rainfall as twice as much rain as there is in reality.. Makes me wonder what other figures are off... None the less its neat to be able to see how much area my swales collect water from.

yukkuri kame wrote:type in an address, draw a box over your roof or other catchment area and it plugs in local rainfall data and does the calcs!  Definitely a step towards putting the designer in the recliner...
http://www.save-the-rain.com/world-bank/

That is so kool. Glad you posted it.

osker brown wrote: This says my average yearly rainfall is 1300mm which is 51 inches.
All other sources say my average yearly rainfall is closer to 37-40 inches, around 1000mm.
That seems like a significant difference.
Is anyone else seeing an inconsistent rain estimate?

Dan alan wrote:Yea this thing is pretty, but it reports annual rainfall as twice as much rain as there is in reality.. Makes me wonder what other figures are off... None the less its neat to be able to see how much area my swales collect water from.

Actually I'm wondering if the both of you did this properly because mine said 300mm and that translates to 11.811 inches and that is just about dead on. I'm wondering what you typed in. Because I type everything for my mum's address with street name/number, city, state, and post code.

this seems great, ill have to check it out the next time i can use a comp and not my phone

got there but am a little confused on how to use it....
my area also may not be available, but one thing i found useful is that my suspicion that rain hates this property is sorta confirmed, our property happens to be in the center of an area that is drier than the surrounding area lol

Very nice. Thanks.

This was fun through the numbers provided, it became evident that my garden can be water almost solely off of harvested water.

And the chickens can be watered just off the rain harvested from their coop (my husband will be changing the roof structure of our coop plans to accommodate cleaner water catch) a nice filter system set up on their rain barrel and they will be good to go

Now to calculate using harvested water from our other out buildings for some other uses (thinking about my daughters "Secret Garden" and that the harvested water may play a very high support roll in accomplishing what we want for her!)

bump